Number of distinct values of the sum of 2 products of three 0..n integers.

Terms

a(0) =3a(1) =12a(2) =36a(3) =75a(4) =157a(5) =254a(6) =434a(7) =635a(8) =911a(9) =1237a(10) =1734a(11) =2162a(12) =2908a(13) =3611a(14) =4461a(15) =5435a(16) =6734a(17) =7879a(18) =9568a(19) =10964a(20) =12861a(21) =14913a(22) =17438a(23) =19426a(24) =22381a(25) =25251a(26) =28482a(27) =31624a(28) =35879a(29) =39100